Retrospective abortion might be a tempting option in the case of certain politicians, but it is unlikely to be a sustainable solution in the general case.

Eugenics was misguided academic research that appealed to racists and was given far too much oxygen in the facist regimes of the 1930s. Certainly it did appeal to those who believed that the breeding of people was most important, including certain members of the UK Royal Family. I think it was more about classifying people than murdering them, although it was used for that pourpose by the Nazis.
We are straying into Godwin’s Law territory here.

Mercifully, Eugenics has not been connected to the abortion debate in the USA. Let’s try to keep it that way.